Silverlight 读取配置文件

<?xml version="1.0" encoding="utf-8" ?>
<menus>
  <menu Header="水利综合网">
    <extranet  LinkName="百度网"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="度网线"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="计算机信息化"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="silverlight委员会" LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="中央气象局"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="联合国"  LinkAdd="http://www.baidu.com"/>
  </menu>
  <menu Header="各省市天气网">
    <extranet  LinkName="中央气象局"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="河北"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="北京"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="添加"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="修改"  LinkAdd="http://www.baidu.com"/>
    <extranet LinkName="百度网盘"  LinkAdd="http://www.baidu.com"/>
  </menu>
  </menus>

private void getXmlDataTask_BeforeStart(object sender, EventArgs e)
        {
            Task task = sender as Task;
            task.MethodName = "ExtranetLink.xml";
            task.ReturnType = typeof(String);
        }

 private void getXmlDataTaskCallBack(Response response)
        {
            tabConExtranet.Items.Clear();
            XDocument document = XmlParseHelper.XmlParse(response.DataString);
            this.Dispatcher.BeginInvoke(() =>
            {
                IEnumerable<XElement> elements = document.Descendants(XName.Get("menu"));
                foreach (XElement parent in elements)
                {
                    TabItem tabItem = new TabItem();
                    tabItem.Header = parent.Attribute(XName.Get("Header")).Value;
                    tabItem.Style = App.Current.Resources["tabItemStyle"] as Style;
                    StackPanel sp = new StackPanel();
                    tabItem.Content = sp;
                    sp.Orientation = Orientation.Horizontal;
                    IEnumerable<XElement> childs = parent.Descendants(XName.Get("extranet"));
                    foreach (XElement child in childs)
                    {
                        HyperlinkButton hyper = new HyperlinkButton();
                        hyper.TargetName = "_blank";
                        hyper.Content = string.Concat("", child.Attribute(XName.Get("LinkName")).Value);
                        hyper.NavigateUri = new Uri(child.Attribute(XName.Get("LinkAdd")).Value);
                        hyper.Style = App.Current.Resources["hyperlinkStyle"] as Style;
                        sp.Children.Add(hyper);
                    }
                    tabConExtranet.Items.Add(tabItem);
                }
            });
        }